Allium cowanii Bulbs – Pure White Ornamental Garlic, Deer Resistant, Perennial, Fall Planting

Allium cowanii — sometimes called White Garlic or Cowanii Allium — is a beautifully pure and elegant ornamental allium producing bright white garlic-like flower clusters that bring a crisp, clean presence to late spring borders. Hardy in Zones 4–8, Cowanii thrives year after year with minimal care, naturalizing freely in well-drained soil and producing its cheerful white blooms as a perfect complement to bold purple and blue alliums, early roses, and perennial companions. Deer, rabbit, and rodent resistant, it also attracts bees, butterflies, and pollinators, and performs beautifully as a cut or dried flower.

Why Gardeners Love It

• Pure white ornamental garlic flowers — crisp, clean elegance in the border
• Hardy and disease resistant — easy to establish and maintain
• Deer, rabbit, and rodent resistant
• Attracts bees, butterflies, and pollinators
• Long-lasting as a fresh cut and dried flower
• Naturalizes freely — returns and spreads year after year

Growing Details

• Type: Ornamental Allium (white)
• Bloom color: Pure white
• Bloom time: Late spring to early summer
• Sunlight: Full sun to part shade
• Soil: Rich, well-draining, neutral pH; benefits from a summer dry period
• USDA Hardiness Zones: 4–8
• Planting depth: 4 inches
• Spacing: 3–4 inches apart
• When to plant: Fall (when soil has cooled to ~55°F)

Planting & Care

Plant bulbs in fall once soil has cooled to approximately 55°F (typically after two weeks of nighttime temperatures around 40°F). Choose a spot with good drainage and moderate sun. Plant 4 inches deep and 3–4 inches apart. Water well after planting. Allow foliage to die back naturally after blooming. Benefits from a dry summer rest period. Returns and naturalizes reliably year after year.